<?php
// func: redirect($to,$code=307)
// spec: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
// http://edoceo.com/creo/php-redirect
function redirect($to,$code=301)
{
	$location = null;
	$sn = $_SERVER['SCRIPT_NAME'];
	$cp = dirname($sn);
	if (substr($to,0,4)=='http') $location = $to; // Absolute URL
	else
	{
		$schema = $_SERVER['SERVER_PORT']=='443'?'https':'http';
		$host = strlen($_SERVER['HTTP_HOST'])?$_SERVER['HTTP_HOST']:$_SERVER['SERVER_NAME'];
		if (substr($to,0,1)=='/') $location = "$schema://$host$to";
		elseif (substr($to,0,1)=='.') // Relative Path
		{
			$location = "$schema://$host/";
			$pu = parse_url($to);
			$cd = dirname($_SERVER['SCRIPT_FILENAME']).'/';
			$np = realpath($cd.$pu['path']);
			$np = str_replace($_SERVER['DOCUMENT_ROOT'],'',$np);
			$location.= $np;
			if ((isset($pu['query'])) && (strlen($pu['query'])>0)) $location.= '?'.$pu['query'];
		}
	}
	$hs = headers_sent();
	if ($hs==false)
	{
		if ($code==301) header("301 Moved Permanently HTTP/1.1"); // Convert to GET
		elseif ($code==302) header("302 Found HTTP/1.1"); // Conform re-POST
		elseif ($code==303) header("303 See Other HTTP/1.1"); // dont cache, always use GET
		elseif ($code==304) header("304 Not Modified HTTP/1.1"); // use cache
		elseif ($code==305) header("305 Use Proxy HTTP/1.1");
		elseif ($code==306) header("306 Not Used HTTP/1.1");
		elseif ($code==307) header("307 Temporary Redirect HTTP/1.1");
		else trigger_error("Unhandled redirect() HTTP Code: $code",E_USER_ERROR);
		header("Location: $location");
		header('Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0');
	}
	elseif (($hs==true) || ($code==302) || ($code==303))
	{
		// todo: draw some javascript to redirect
		$cover_div_style = 'background-color: #ccc; height: 100%; left: 0px; position: absolute; top: 0px; width: 100%;';
		echo "<div style='$cover_div_style'>\n";
		$link_div_style = 'background-color: #fff; border: 2px solid #f00; left: 0px; margin: 5px; padding: 3px; ';
		$link_div_style.= 'position: absolute; text-align: center; top: 0px; width: 95%; z-index: 99;';
		echo "<div style='$link_div_style'>\n";
		echo "<p>Please See: <a href='$to'>".htmlspecialchars($location)."</a></p>\n";
		echo "</div>\n</div>\n";
	}
	exit(0);
}
?>